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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '78aff6623c9c8c3b86a7d74944f9113a2a93d98b5a2433ded6c225e56386c6fd' 
  AND token = 'oo5Z+3vCTy+WcWTDabD+Ytk5HkgjEuQetQAV2ID/VAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}